package com.ruoyi.answer.common.interceptor;

import com.ruoyi.answer.common.annotation.Login;
import com.ruoyi.answer.common.exception.UnauthorizedException;
import com.ruoyi.answer.entity.AdminUser;
import com.ruoyi.answer.service.AdminUserService;
import com.ruoyi.common.utils.JwtUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;


public class AuthenticationInterceptor implements HandlerInterceptor {
    public static final String USER_KEY = "account";

    @Autowired
    AdminUserService adminUserService;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
                             Object object) throws Exception {
        String token = request.getHeader("token");// 从 http 请求头中取出

        // token
        // 如果不是映射到方法直接通过
        if (!(object instanceof HandlerMethod)) {
            return true;
        }
        HandlerMethod handlerMethod = (HandlerMethod) object;
        Method method = handlerMethod.getMethod();
        // 检查是否有passtoken注释，有则跳过认证
        if (!method.isAnnotationPresent(Login.class)) {
            return true;
        } /*else {
            Login passToken = method.getAnnotation(Login.class);
            if (passToken.required()) {
                return true;
            }
        }*/
        // 执行认证
        if (token == null) {
            throw new RuntimeException("无token，请重新登录");
        }
        String username = JwtUtil.getUsername(token);
        if (username == null) {
            throw new RuntimeException("token invalid");
        }
        // 验证 token
        if (!JwtUtil.verify(token, username)) {
            throw new UnauthorizedException();
        }
        AdminUser appUser = adminUserService.findByUsername(username);
        if (appUser == null) {
            throw new RuntimeException("用户不存在，请重新登录");
        }

        // 设置userId到request里，后续根据userId，获取用户信息
        request.setAttribute(USER_KEY, username);
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o,
                           ModelAndView modelAndView) throws Exception {
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse,
                                Object o, Exception e) throws Exception {
    }
}
